Nannostructure and significance of fish coprolites in phosphorites
Identifieur interne : 002117 ( Main/Curation ); précédent : 002116; suivant : 002118Nannostructure and significance of fish coprolites in phosphorites
Auteurs : Michel Lamboy [France] ; Venigalla Purnachandra Rao [Inde] ; Ezzat Ahmed [Égypte] ; Nasreddine Azzouzi [France]Source :
- Marine Geology [ 0025-3227 ] ; 1994.
Abstract
Phosphatic coprolites (0.5–2 cm long) occurring in Cretaceous-Eocene phosphorites of Tunisia, Morocco, Mauritania, Senegal, and Egypt were investigated for their petrology by using SEM. They exhibit a homogeneous porous apatite structure with a few fish remains. The nannostructures of the coprolites consist of inframicron-sized and botryoid-type apatite microparticles. Spherical cavities and cavity-infill cavity-infilled inframicron-sized apatite globules are typical in the coprolites and are apparently formed by extracellular precipitation of phosphate around microbial organisms. We presume that the coprolites studied here may belong to fishes, whose excrements contain abundant organic matter and phosphate. Phosphatization of excrements appears to be a microbial process controlled by the microenvironment.The nannostructures observed in the coprolites investigated here differ significantly from the nannostructures of other studied phosphatic grains (pellets and coated grains) in the same samples which are mostly heterogeneous and consist of ovoid-type apatite particles. In the case they are not reworked, the centimetre to decimetre thick coprolite beds in phosphorites indicate a lack of detrital input and strong bottom water currents at the sediment-water interface during deposition and subsequent phosphatization of the excrements.
Url:
DOI: 10.1016/0025-3227(94)90068-X
Links toward previous steps (curation, corpus...)
- to stream Istex, to step Corpus: Pour aller vers cette notice dans l'étape Curation :000D31
- to stream Istex, to step Curation: Pour aller vers cette notice dans l'étape Curation :000D31
- to stream Istex, to step Checkpoint: Pour aller vers cette notice dans l'étape Curation :000F52
- to stream Main, to step Merge: Pour aller vers cette notice dans l'étape Curation :002179
Links to Exploration step
ISTEX:749BDC16B23A9B3206F23F924B2B8611FF208399Le document en format XML
<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title>Nannostructure and significance of fish coprolites in phosphorites</title>
<author><name sortKey="Lamboy, Michel" sort="Lamboy, Michel" uniqKey="Lamboy M" first="Michel" last="Lamboy">Michel Lamboy</name>
</author>
<author><name sortKey="Rao, Venigalla Purnachandra" sort="Rao, Venigalla Purnachandra" uniqKey="Rao V" first="Venigalla Purnachandra" last="Rao">Venigalla Purnachandra Rao</name>
</author>
<author><name sortKey="Ahmed, Ezzat" sort="Ahmed, Ezzat" uniqKey="Ahmed E" first="Ezzat" last="Ahmed">Ezzat Ahmed</name>
</author>
<author><name sortKey="Azzouzi, Nasreddine" sort="Azzouzi, Nasreddine" uniqKey="Azzouzi N" first="Nasreddine" last="Azzouzi">Nasreddine Azzouzi</name>
</author>
</titleStmt>
<publicationStmt><idno type="wicri:source">ISTEX</idno>
<idno type="RBID">ISTEX:749BDC16B23A9B3206F23F924B2B8611FF208399</idno>
<date when="1994" year="1994">1994</date>
<idno type="doi">10.1016/0025-3227(94)90068-X</idno>
<idno type="url">https://api.istex.fr/document/749BDC16B23A9B3206F23F924B2B8611FF208399/fulltext/pdf</idno>
<idno type="wicri:Area/Istex/Corpus">000D31</idno>
<idno type="wicri:Area/Istex/Curation">000D31</idno>
<idno type="wicri:Area/Istex/Checkpoint">000F52</idno>
<idno type="wicri:doubleKey">0025-3227:1994:Lamboy M:nannostructure:and:significance</idno>
<idno type="wicri:Area/Main/Merge">002179</idno>
<idno type="wicri:Area/Main/Curation">002117</idno>
</publicationStmt>
<sourceDesc><biblStruct><analytic><title level="a">Nannostructure and significance of fish coprolites in phosphorites</title>
<author><name sortKey="Lamboy, Michel" sort="Lamboy, Michel" uniqKey="Lamboy M" first="Michel" last="Lamboy">Michel Lamboy</name>
<affiliation wicri:level="3"><country xml:lang="fr">France</country>
<wicri:regionArea>Department of Geology, University of Rouen, B.P. 118, 76821 Mont-Saint-Aignan</wicri:regionArea>
<placeName><region type="region" nuts="2">Région Normandie</region>
<region type="old region" nuts="2">Haute-Normandie</region>
<settlement type="city">Mont-Saint-Aignan</settlement>
</placeName>
</affiliation>
</author>
<author><name sortKey="Rao, Venigalla Purnachandra" sort="Rao, Venigalla Purnachandra" uniqKey="Rao V" first="Venigalla Purnachandra" last="Rao">Venigalla Purnachandra Rao</name>
<affiliation wicri:level="1"><country xml:lang="fr">Inde</country>
<wicri:regionArea>Geological Oceanography Division, National Institute of Oceanography, Dona Paula, Goa, 403004</wicri:regionArea>
<wicri:noRegion>403004</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Ahmed, Ezzat" sort="Ahmed, Ezzat" uniqKey="Ahmed E" first="Ezzat" last="Ahmed">Ezzat Ahmed</name>
<affiliation wicri:level="1"><country xml:lang="fr">Égypte</country>
<wicri:regionArea>Department of Geology, University of Assiut, 71516</wicri:regionArea>
<wicri:noRegion>71516</wicri:noRegion>
</affiliation>
</author>
<author><name sortKey="Azzouzi, Nasreddine" sort="Azzouzi, Nasreddine" uniqKey="Azzouzi N" first="Nasreddine" last="Azzouzi">Nasreddine Azzouzi</name>
<affiliation wicri:level="3"><country xml:lang="fr">France</country>
<wicri:regionArea>Department of Geology, University of Rouen, B.P. 118, 76821 Mont-Saint-Aignan</wicri:regionArea>
<placeName><region type="region" nuts="2">Région Normandie</region>
<region type="old region" nuts="2">Haute-Normandie</region>
<settlement type="city">Mont-Saint-Aignan</settlement>
</placeName>
</affiliation>
</author>
</analytic>
<monogr></monogr>
<series><title level="j">Marine Geology</title>
<title level="j" type="abbrev">MARGO</title>
<idno type="ISSN">0025-3227</idno>
<imprint><publisher>ELSEVIER</publisher>
<date type="published" when="1994">1994</date>
<biblScope unit="volume">120</biblScope>
<biblScope unit="issue">3–4</biblScope>
<biblScope unit="page" from="373">373</biblScope>
<biblScope unit="page" to="383">383</biblScope>
</imprint>
<idno type="ISSN">0025-3227</idno>
</series>
<idno type="istex">749BDC16B23A9B3206F23F924B2B8611FF208399</idno>
<idno type="DOI">10.1016/0025-3227(94)90068-X</idno>
<idno type="PII">0025-3227(94)90068-X</idno>
</biblStruct>
</sourceDesc>
<seriesStmt><idno type="ISSN">0025-3227</idno>
</seriesStmt>
</fileDesc>
<profileDesc><textClass></textClass>
<langUsage><language ident="en">en</language>
</langUsage>
</profileDesc>
</teiHeader>
<front><div type="abstract" xml:lang="en">Phosphatic coprolites (0.5–2 cm long) occurring in Cretaceous-Eocene phosphorites of Tunisia, Morocco, Mauritania, Senegal, and Egypt were investigated for their petrology by using SEM. They exhibit a homogeneous porous apatite structure with a few fish remains. The nannostructures of the coprolites consist of inframicron-sized and botryoid-type apatite microparticles. Spherical cavities and cavity-infill cavity-infilled inframicron-sized apatite globules are typical in the coprolites and are apparently formed by extracellular precipitation of phosphate around microbial organisms. We presume that the coprolites studied here may belong to fishes, whose excrements contain abundant organic matter and phosphate. Phosphatization of excrements appears to be a microbial process controlled by the microenvironment.The nannostructures observed in the coprolites investigated here differ significantly from the nannostructures of other studied phosphatic grains (pellets and coated grains) in the same samples which are mostly heterogeneous and consist of ovoid-type apatite particles. In the case they are not reworked, the centimetre to decimetre thick coprolite beds in phosphorites indicate a lack of detrital input and strong bottom water currents at the sediment-water interface during deposition and subsequent phosphatization of the excrements.</div>
</front>
</TEI>
</record>
Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Wicri/France/explor/LeHavreV1/Data/Main/Curation
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 002117 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Curation/biblio.hfd -nk 002117 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien |wiki= Wicri/France |area= LeHavreV1 |flux= Main |étape= Curation |type= RBID |clé= ISTEX:749BDC16B23A9B3206F23F924B2B8611FF208399 |texte= Nannostructure and significance of fish coprolites in phosphorites }}
This area was generated with Dilib version V0.6.25. |